I was not so interested in this manga plot-wise. There was a mystery going on, that's for sure, but I didn't find it so enticing as other mystery manga. It is a running plot, so it works, but I do think the curse could have been explained better in the end.
The romance was a little rushed for me. Another few chapters to develop it a little more would have convinced me of true love, as it didn't seem completely genuine.
What I loved most about the manga was the art. It is absolutely phenomenal. I was constantly marveling at Seri's hair and eyes, and everyone's body structures were also on point. The only thing I disliked were how long Yuzuki's eyelashes were because he was drawn to be bishounen and I am not so partial to pretty boys, but he was also beautiful.
There are some sex scenes in here. I could tolerate one scene, but I think there were about three, and I think they were unnecessary to the story.
Otherwise, I'll give this manga a solid 7. The plot is not particularly engaging, but some of it is good, and the art is definitely great.